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The streamline representation of local fiber tract within (a) ROI-1, (b) ROI-2, and (c) ROI-3 as marked in Fig. 2(a). The three slices shown were obtained at depths of 0.3mm, 0.4mm, and 0.5mm from the surface. (d) The local optical axis extracted at different depths from the center of the three ROIs within a small area of 3pixel × 3pixel.
